Method and apparatus for optimizing a PRML data-receiving channel for data-storage systems

a data-storage system and data-receiving channel technology, applied in the direction of instruments, magnetic recording, recording/reproducing/erasing methods, etc., can solve the problems of metric measurements generally not being used directly in the system, unable to achieve the final optimization of the system, and unable to accurately measure the reference value directly

Inactive Publication Date: 2006-08-03
STMICROELECTRONICS SRL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0022] One principle on which this invention stands is to effect a selection of the error sequence to be used to obtain the optimization parameter of the...

Problems solved by technology

Unfortunately, this measurement is often difficult to obtain at the calibration stage, and accordingly, measuring the reference value directly can hardly represent a workable basis for a method of automatically optimizing the system equalisation parameters.
Although the value provided by this technique does lie within the optimum range of the parameters, it is wholly ineffective for the purpose of the system final optimization because, in general, it is not adequately correlated with the error rate.
However, metric mea...

Method used

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  • Method and apparatus for optimizing a PRML data-receiving channel for data-storage systems
  • Method and apparatus for optimizing a PRML data-receiving channel for data-storage systems
  • Method and apparatus for optimizing a PRML data-receiving channel for data-storage systems

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Embodiment Construction

[0030] The following discussion is presented to enable a person skilled in the art to make and use the invention. Various modifications to the disclosed embodiments will be readily apparent to those skilled in the art, and the generic principles herein may be applied to other embodiments and applications without departing from the spirit and scope of the present invention as defined by the appended claims. Thus, the present invention is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.

[0031] With reference to the drawings, in particular to the embodiment shown in FIG. 4, a data receiving system 20 is generally and schematically shown and incorporates a functional portion 25 for its optimization according to an embodiment of the invention.

[0032] The same reference numerals will be used throughout to denote some particulars and parts function-wise equivalent to those of the conven...

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Abstract

A method is provided for optimizing a PRML (Partial Response Maximum Likelihood) receiving channel for mass memory data receiving systems comprising an input receiving channel, a receiver placed downstream of the channel, a detector connected in cascade to the receiver, and a summing node being input both the receiver output through a delay line, and the output from the detector through an impulsive filter. The method includes performing an indirect estimate of the noise strength by filtering out the error sequence, i.e. the output signal from the summing node, through a filter, and selecting either the output from the summing node or the output from the filter to obtain an optimization parameter for feedback to the receiving system.

Description

TECHNICAL FIELD [0001] The present invention relates generally to a method of optimizing a PRML (Partial Response Maximum Likelihood) data receiving channel, for mass memory data storage systems. [0002] The invention relates more particularly, but not exclusively, to a method of optimizing the performance of a data receiving system comprising an input receiving channel, a receiver placed downstream of the channel, and a detector connected in cascade to the receiver. [0003] The invention further relates to a data receiving system comprising an input receiving channel, a receiver placed downstream of the channel, and a detector connected in cascade to the receiver. BACKGROUND ART [0004] Briefly, an embodiment of the invention relates to a method of indirectly measuring and optimizing the performance of a data receiving system, such as the system schematically shown in FIG. 1 of the drawings. [0005] Systems of this kind require that a step of optimizing a PRML receiving channel be carr...

Claims

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Application Information

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IPC IPC(8): G11B5/09G11B20/10
CPCG11B20/10009
Inventor DATI, ANGELOTONCI, CECILIAGADUCCI, PAOLO
Owner STMICROELECTRONICS SRL
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